... . For Video talking pen 4. Help design the sound book 5. Music & Record Features:1, Touch&Read TechnologyOne ... a optical sensor in its head, and the book has been designed to put the invisible 2-D ... more booksIn order to read the books, one book correspond with one computer file. We use 512M ... example, we can use Chinese , English and Japanese in one book, It is useful for children to learn languages ...